What is cleverness?

One day a father was teaching his son and said, "The keys to your success are keeping your word and cleverness.  Once you promise somebady a promise, you must carry it out on matter what will happen.  This is called 'keeping one's word.'

     "What is cleverness? asked his son.

     "Cleverness is that you'll never make such a promise, " the father asnswered.

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